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> [!NOTE]
> **Note:** Apigee Extensions are available in the Edge UI to Google Cloud Apigee customers with an Enterprise [support](https://cloud.google.com/apigee/pricing) plan.

<br />

Apigee Edge includes several extensions designed to integrate the functionality of
external resources into your API proxies by using the [ExtensionCallout policy](https://docs.apigee.com/api-platform/reference/policies/extension-callout-policy).
This page lists references for included extensions.

These topics provide reference for configuring and using each extension. For steps to configure an extension using the Apigee console, see [Adding and configuring an extension](https://docs.apigee.com/api-platform/extensions/configuring-an-extension).

For more about how you can use extensions to integrate external resources with your API proxies, see [What are extensions?](https://docs.apigee.com/api-platform/extensions/extensions-overview).

For a hands-on introduction to extensions, see [Tutorial: Adding and using an extension](https://docs.apigee.com/api-platform/tutorials/add-extension/intro).

## Extensions for Google services

| Extension | Description |
|---|---|
| [Google Authentication Extension](https://docs.apigee.com/api-platform/reference/extensions/google-cloud-auth-extension) | Authenticate with Google for access to the Google APIs you specify. |
| [Google BigQuery Extension](https://docs.apigee.com/api-platform/reference/extensions/google-bigquery-extension) | Insert rows into a BigQuery table. List rows from the table. |
| [Google Cloud Data Loss Prevention Extension](https://docs.apigee.com/api-platform/reference/extensions/google-cloud-data-loss-prevention-extension) | Obscure sensitive data from content and images. |
| [Google Cloud Firestore Extension](https://docs.apigee.com/api-platform/reference/extensions/google-cloud-firestore-extension) | Create, read, or delete data in a Cloud Firestore database. |
| [Google Cloud Functions Extension](https://docs.apigee.com/api-platform/reference/extensions/google-cloud-functions/google-cloud-functions-extension-105) | Invoke Cloud Functions that are deployed through your Google Cloud project. |
| [Google Cloud Natural Language Extension](https://docs.apigee.com/api-platform/reference/extensions/google-cloud-natural-language-extension) | Classify content by applying categories, as well as to analyze content sentiment on a positive to negative scale. |
| [Google Cloud Pub/Sub Extension](https://docs.apigee.com/api-platform/reference/extensions/google-cloud-pub-sub/google-cloud-pub-sub-extension-changelog) | Publish messages to a Google Cloud Pub/Sub topic. |
| [Google Cloud Spanner Database Extension](https://docs.apigee.com/api-platform/reference/extensions/google-cloud-spanner-database-extension) | Perform insert, update, and query operations on a Cloud Spanner database. |
| [Google Cloud Storage Extension](https://docs.apigee.com/api-platform/reference/extensions/google-cloud-storage-extension) | Consume content stored in a Cloud Storage bucket. This extension requires that a Service Account JSON key file be supplied for client authentication. |
| [Google Cloud Vision Extension](https://docs.apigee.com/api-platform/reference/extensions/google-cloud-vision-extension) | Analyze images to understand their content. |
| [Google Machine Learning Engine Extension](https://docs.apigee.com/api-platform/reference/extensions/machine-learning-engine) | Request predictions from an existing trained model via Cloud Machine Learning Engine. |
| [Google Cloud Logging Extension](https://docs.apigee.com/api-platform/reference/extensions/google-cloud-logging-extension) | Write entries to Cloud Logging logs. |

## Extensions for other services

| Extension | Description |
|---|---|
| [Amazon S3 Extension](https://docs.apigee.com/api-platform/reference/extensions/amazon-s3-extension) | Manage files in an Amazon S3 bucket. |
| [AWS Lambda Extension](https://docs.apigee.com/api-platform/reference/extensions/aws-lambda-extension) | Execute functions deployed on AWS Lambda. |
| [Informatica Integration Cloud Extension](https://docs.apigee.com/api-platform/reference/extensions/informatica-integration-extension) | Retrieve and execute Informatica business and integration processes. |
| [Salesforce Extension](https://docs.apigee.com/api-platform/reference/extensions/salesforce-extension) | Access data in your Salesforce account. Insert, update, retrieve, and query data. |